Hoover Dam

The Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the US states of Nevada and Arizona. It was built between 1931 and 1936 during the Great Depression, and it was known as "Boulder Dam" from 1933 to 1947, when the US Congress renamed it after President Herbert Hoover. The dam's generators provide power for public and private utilities in Nevada, Arizona, and California, and it is a major tourist attraction.